Living your best life!! - that's all that matters and makes me so happy to read!
My .02: it's pure coincidence. She was clearly shocked and completely taken by surprise.
Enjoy your own world - take it all in John. She's in the past and clearly leaving her was the best decision you made...don't add any more ties with investigations, etc: that's exactly what she would LOVE - one reason for her to think you even think about her for one second.
Let it go - other than getting a great entertaining story to write - this run-in need not dampen your living your best life!
Happy condo hunting! Say hi to Mary! ;-)
(I just get a kick out of her seeing the wedding bands and flipping out...LOL...so awesome - dang I must sound mean, but I can't stand how she treated you when you still went to care for her when she had no one.)